Factorial prime
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A factorial prime is a number that is one less or one more than a factorial and is also a prime number. The first few factorial primes are:
Factorial primes are of interest to number theorists because their absence sometimes signals the end or the beginning of a lengthy run of consecutive composite numbers. For example, the prime following 6227020777 is 6227020867.
External links
- Mathworld entry for factorial primes (http://mathworld.wolfram.com/FactorialPrime.html)it:Primo fattoriale